Селектор :nth-child()

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Содержание:

nth-child selector

Описание: Selects all elements that are the nth-child of their parent.

  • Добавлен в версии: 1.1.4jQuery( ":nth-child(index/even/odd/equation)" )

    index: The index of each child to match, starting with 1, the string even or odd, or an equation ( eg. :nth-child(even), :nth-child(4n) )

Because jQuery's implementation of :nth- selectors is strictly derived from the CSS specification, the value of n is "1-indexed", meaning that the counting starts at 1. For other selector expressions such as :eq() or :even jQuery follows JavaScript's "0-indexed" counting. Given a single <ul> containing two <li>s, $( "li:nth-child(1)" ) selects the first <li> while $( "li:eq(1)" ) selects the second.

The :nth-child(n) pseudo-class is easily confused with :eq(n), even though the two can result in dramatically different matched elements. With :nth-child(n), all children are counted, regardless of what they are, and the specified element is selected only if it matches the selector attached to the pseudo-class. With :eq(n) only the selector attached to the pseudo-class is counted, not limited to children of any other element, and the (n+1)th one (n is 0-based) is selected.

Further discussion of this unusual usage can be found in the W3C CSS specification.